diff --git a/golem_season/models/golem_season.py b/golem_season/models/golem_season.py
index ebdf2a5..97f3aa1 100644
--- a/golem_season/models/golem_season.py
+++ b/golem_season/models/golem_season.py
@@ -41,12 +41,11 @@ class GolemSeason(models.Model):
     @api.onchange('membership_id')
     def _onchange_season_dates(self):
         """ Sets defaults dates according to membership type """
-        for activity in self:
-            if activity.membership_id:
-                if not activity.date_start:
-                    activity.date_start = activity.membership_id.membership_date_from
-                if not activity.date_end:
-                    activity.date_end = activity.membership_id.membership_date_to
+        for season in self:
+            if season.membership_id:
+                if not season.date_start:
+                    season.date_start = season.membership_id.membership_date_from
+                    season.date_end = season.membership_id.membership_date_to
 
     @api.constrains('date_start', 'date_end')
     def _check_period(self):